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Understanding
9/11- Usage
- Public Domain Mark 1.0
In late 1940 Alan Turing wrote a report describing the methods he and
his colleagues at Bletchley Park had used to break into the German
Enigma cipher systems. At Bletchley it was known as 'the Prof's Book.' A
copy of this handbook was at last released from secrecy by the American
National Security Agency in April 1996, under the title 'Turing's
Treatise on the Enigma.' Subsequently, a much better original copy was
released by the (British) National Archives, box HW 25/3. This also
revealed a title which had been lost in the American copy: Mathematical theory of ENIGMA machine. (Though, oddly, the report does not actually have any mathematical theory.)
his colleagues at Bletchley Park had used to break into the German
Enigma cipher systems. At Bletchley it was known as 'the Prof's Book.' A
copy of this handbook was at last released from secrecy by the American
National Security Agency in April 1996, under the title 'Turing's
Treatise on the Enigma.' Subsequently, a much better original copy was
released by the (British) National Archives, box HW 25/3. This also
revealed a title which had been lost in the American copy: Mathematical theory of ENIGMA machine. (Though, oddly, the report does not actually have any mathematical theory.)
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